How I learnt quick scoping: my friend was quite good at sniping and he told me the only way to get better at it was to play a lot of sniper only-s, using TPG-1 as the starter quick scoping weapon. The TPG-1 is a REALLY easy quickscoping gun to use, so start off with that, and move onto Arctic Wolf and as it gets harder to quickscope, but you gradually get better at it. After a while, when you use TPG again, it's hella easy